The Collaborative International Dictionary of English v.0.48:

Euryalida \Eu`ry*al"i*da\, n. pl. [NL.] (Zo["o]l.)
   A tribe of Ophiuroidea, including the genera Euryale,
   Astrophyton, etc. They generally have the arms branched.
   See Astrophyton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Euryalida
    n 1: basket stars [syn: Euryalida, subclass Euryalida]